Attwood hull-mounted vents are designed to install by fastening as a complete unit from either inside or outside the hull. Ventilation hose (not included) twists into the bottom of the box to form a raised water barrier. Plastic vents are corrosion-resistant, will not discolor. All collector boxes and vents are designed for intake or exhaust and meet ABYC H-2 cross sectional area requirements.

• For use with 3" I.D. wire-supported ventilation hose
• Features flexible hose flange that is screwed onto hose, then vent snaps onto the flange
• Vent constructed of chrome-plated die-cast Perma-Plate ZAMAK
• Flange is non-corrosive plastic
• Installs with #8 screws
• Installation Hole Size: 3-1/4" to 3-1/2"